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a×15÷3+256-21=345 (mers invers ) va rogggggggg

Răspuns :

A×15÷3+256-21=345
A×15÷3+256=345+21=366
A×15÷3=366-256=110
A×15=110x3=330
A×15=330 A=330:15=22
A=22





A×15÷3+256-21=345ax15:3+256=345+21
ax15:3=366-256
ax15=110x3
a=330:15
a=22